1
                           general:: 
                              noun ADJ.  mere, passive | interested | paying | cricket, football, sports, etc. QUANT.  crowd SPECTATOR + VERB  gather, turn up | line sth Spectators lined the route of the president's walkabout. | applaud (sb/sth), boo (sb/sth), cheer (sb/sth) SPECTATOR + NOUN  event, sport
                        
                        
 
                        
                            Oxford Collocations Dictionary
                        
                        
                    
                    
                        2
                           general:: 
                            someone who watches something 
spectator 
someone who watches an event, especially a sports event: 
• There were 4,500 spectators at the game. • a crowd of spectators 
viewer 
someone who watches television: 
• Millions of television viewers listened to the President’s speech. • programmes for younger viewers 
audience 
the people who watch a play or performance, or the people who watch a particular television programme: 
• The audience roared with laughter and clapped. • It attracted a television audience of seven million. 
onlooker 
someone who watches something happening without being involved in it, especially in the street: 
• A man was standing on the roof, watched by a crowd of onlookers below. 
observer 
someone who watches and pays attention to particular situations and events, because they are interested in them, or it is their job: 
• She was a shrewd observer of human nature. • a political observer who writes for The Independent newspaper • The United Nations has sent military observers to the Sudan.
                        
                        
 
                        
                            Longman-Thesaurus